slipjoint spring tension and solidworks

C

clockworkfish

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Dec 1, 2010
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I Just modeled a slipjoint on solidworks, and then laser cut it out of acrylic to make sure it was a good size, looks nice, and that the spring works. i found i needed to modify the spring design so it was flexed a lot downwards. This made me wonder about the when i actually go ahead and waterjet cut the spring will it need to have much of a bend in it to actually hold tension? the way i have it in solidworks right now has the spring and the blade just resting on each other, will that work? (my thinking is it will not but figured i should ask anyway)

Thanks for your help!
 
The spring tension is what makes the knife work. You can always make the spring thinner in places after you start assembly to make the pull lighter.
 
When makeing a slip joint you need to load the spring,when you get the tang and spring rise and fall set,then you have to raise the other end of the spring about a 1/16" then drill you liners.This will load the spring.

Stan
 
Exactly what Stan said, if the spring is laying on the tang of the knife in the open position
push up on the back bottom of the spring to create tension. As Chuck said above that you can
always make it less, tough to make it more. In a good fit up after the holes are drilled the
farthest one back needs to be about 1/2 a hole off.
Ken.
 
The same thought but different approach, if the spring is bent down to overlap the blade by 2mm you have the same effect but can drill the hole in the handle and liner. This will make layout on the computer more consistent with the hold drilled in the same location.
 
awesome! so base the holes in the handle on the spring after its been loaded? or with patricks method could it all be laid out in one file?
 
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